Fixes Homebrew/homebrew#11298.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

A common source of build problems on Xcode 4.3+ is outdated compilers,
usually when a user has installed over top of an old version and hasn't
installed the CLT. Since the compilers from the previous Xcode are still
around, brew doctor wouldn't complain.

This adds a hash containing a list of the canonical compiler versions
for supported versions of Xcode, and adds a check against that to determine
whether a given installation has any compilers which are out of date.

Closes Homebrew/homebrew#11518.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>

Closes Homebrew/homebrew#11417.

Attempting to call certain methods on the Cellar before it exists,
such as realpath, would cause brew doctor to throw unnecessary "file
does not exist" errors. This was fixed once before, but new tests
have been added since without the appropriate checks.
cf. 0d28bc78d71590c8e8a5961d8d10e3d7d9b8822d

Fixes Homebrew/homebrew#5188 (again).

Closes Homebrew/homebrew#11418.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Having path directories with trailing slashes can cause other false
warnings.

Closes Homebrew/homebrew#9986.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Closes Homebrew/homebrew#11044.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Fixes Homebrew/homebrew#11018.

We warn if you are not running the latest Leopard or Snow Leopard.
(We do not currently check Lion or Mountain Lion versions.)

Since these cause trouble.

Refs Homebrew/homebrew#10874.

Closes Homebrew/homebrew#10962.

Signed-off-by: Max Howell <max@methylblue.com>

Fed up dealing with this bug in xcode-select.

Commit ee2c3ab ("Remove spurious libiconv dependencies") pruned all
existing "depends_on 'libiconv'" usages from Homebrew in preparation for
removing the libiconv dupe itself.

Now that is done, and we can remove and blacklist it. It can be obtained
from Homebrew-alt.

Closes Homebrew/homebrew#10464.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Homebrew itself is found under HOMEBREW_REPOSITORY,
which *may* be the same HOMEBREW_PREFIX, but does not have
to be if you link brew into /usr/local/bin from another location.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Closes Homebrew/homebrew#10809.

Some people seem to have an older xcode-select even after installing the CLT from inside Xcode or otherwise. So this is works for both.

Now we aren't future-proofed in case Apple change the location, but hopefully they won't, seems unlikely.

Refs Homebrew/homebrew#10743. Fixes Homebrew/homebrew#10745.

Well at least it checks to see if it's been a while since the last one.

If there are multiple dependencies missing, 'brew doctor' can suggest
that you run something like:

  brew install autoconf libyaml autoconf, libyaml

This commit improves that output.

Closes Homebrew/homebrew#10720.

Signed-off-by: Max Howell <max@methylblue.com>

Refs Homebrew/homebrew#9541.

The order of things made the check for git in the path pointless (and
was my fault); this is a better way to do it.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

It was confusing that it told you to brew install missing deps and then listed formula that were already installed IMO.

I saw a ticket with just doctor output and no `brew --config`. This helps.

Closes Homebrew/homebrew#10624.

Signed-off-by: Max Howell <max@methylblue.com>

Closes Homebrew/homebrew#10626.

Signed-off-by: Max Howell <max@methylblue.com>

Closes Homebrew/homebrew#9199.

Please check for regressions. I was careful, but there was a lot of stuff.

Closes Homebrew/homebrew#9409.

Fixes Homebrew/homebrew#10598.

Ideally we would show a message for builds that use xcodebuild etc. But there is no easy mechanism for this in place.